Generalize the label glossary

[delhomer]

For now, we are dealing with hard-coded labels (see geo3dfeatures/tools/__init__.py). A better practice could be to pass the dataset glossary as an argument for each program (e.g. -l/--label-glossary).

We could have a configuration file for each dataset of interest, like:

• config/dataset_1.json
• ...
• config/dataset_n.json